Portable display device with graphical user interface



FIG. 1 is a front view of a portable display device with graphical user interface showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines shown in the drawings represent unclaimed portions of the portable display device with graphical user interface and form no part of the claimed design. 

CLAIM The ornamental design for a portable display device with graphical user interface, as shown and described. 